Series 3 Glow plug warning lamp

Stormintrooper

Active Member

Posts

205

Location

Birmingham

• Mar 15, 2020

• #1

Hi all.

Almost finished with the re-wire job and got stumped by the warning light.
I have there newer type plugs wired in parallel so I know I bypass the resistor
But I can't get the warning light to illuminate when glows are powered. I'm obviously missing an obvious thing but it's eluding me.
To the best of my knowledge its all put back together correct. Tested continuity on the wires.

Checked the old loom and all seems to be the same. It's surely not as simple as putting one of the wires to ground is it?

 

ExMil109

Active Member

Posts

168

Location

Scottish Borders

• Mar 15, 2020

• #2

Yep, it probably is as simple as grounding one of the wires to the warning lamp.
With the older series-wired glow-plugs, the warning light is across the resistor, but now that you've bypassed the resistor, the lamp is not getting any voltage across it when the plugs are on. So just take one of the lamp wires to earth.
Bear in mind, though, that the old system used a 6V bulb across the resistor, so it may lead a short (but bright) life now that it's getting a 12V feed!

 

mystery

Well-Known Member

Posts

1,510

Location

BULKINGTON

• Mar 16, 2020

• #3

 

Stormintrooper

Active Member

Posts

205

Location

Birmingham

• Mar 16, 2020

• #4

I thought as much, I wonder why it worked before without going to a ground?

 

Blackburn

Well-Known Member

Posts

3,105

Location

Tyneside

• Mar 16, 2020

• #5

It was being powered by the voltdrop across the resistor ie max 6V

 

Stormintrooper

Active Member

Posts

205

Location

Birmingham

• Mar 21, 2020

• #6

Blackburn said:

It was being powered by the voltdrop across the resistor ie max 6V

Click to expand...

I thought that too, wonder why it wont work now?

 

steve2286w

Well-Known Member

Posts

4,524

Location

monkeyangerland

• Mar 21, 2020

• #7

If you have put the parallel plugs on but powered them as the series set up they won’t be getting the full 12v
How have you wired yours , is it same as mystery diagram can you put a pic up
To get the bulb to work fix one end to the heavy power lead going to no 4 heater plug and earth the other end, I used the bypass resistor fixing as it’s handy
Ensure the 6v bulb changed for 12v type